It might be worthwhile to go ahead and re-pack your bearings. If you're worried about some long distance trips coming up, you can have peace of mind with the freshly packed bearings, and while you have them out of the hub, you can go match them up to buy backups that you know are the right size.

0ne of the best purchases I ever made was a Infrared red heat gun ( Amazon , $22.00) . I take it with me when towing my boat , I take it out when towing and get an exact heat reading of the tires and the hubs . I get a baseline reading when I know my hubs are well greased and running smooth --then any heat increase of significance can be attributed to early bearing wear . It also gives me a decent indication if one of the tires is wearing " odd" and heating up . It might not be perfect , but it gives me an idea of a "hot " bearing or tire .